Phonograph-stop



F. A. NOLAN. PHONOGRAPH STOP.

APPLICATION FILED (NIT. |3| I91 Patented Apr. 6, 1920.

FRANCIS .A. NOLAN, OF ST. PAUL, MINNESOTA.

PHONOGRAPH-STOP.

Specification of Letters Patent.

Patented Apr. 6, 1920.

Application filed October is, 1917. {stam na 196,882.

f To all whom it may concern:

Be it known that I, FRANCIS A. NOLAN, a c tizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented a new and useful Improvement in Phonograph-Stops, of

which the following is a specification.

This invention relates to improvements in stops for sound reproducingmachines. More particularly this invention relates to that class ofstops which can be easily set for arresting the rotation of the .recordstructure precisely at the end of the record being played. My inventioncontemplates certain novel features pertaining to both the brakemechanism employed and the stop which is adapted to automaticallyrelease the brake and cause it to stop the machine.

With these and other objects in view, my invention. comprises thefeatures of construe tion and combination of parts, which willhereinafter be more particularly described and claimed.

In the accompanying drawing forming part of this specification, Figure 1is a plan of a portion of a sound reproducing machine, to which myinvention is shown applied part of the structure of said machine beingbroken away and in section; Fig. 2 is a section taken on the line X-Xof-Fig. 1; Fig. 3 is a side elevation of an alternative construction ofthe trip or stop device, a detail of the sound record being shown;

. Fig. 4 is a planof an alternative construction; Fig. 5 is a rspectiveof another alternative construction; Fig. 6 is a section of a detail ofa sound tube showing the trip or stop illustrated in Fig. 5 appliedthereto, and Fig. 7 is a section of an alternative construction, theposition of the section being relative to the line XX. Fig. 1.

In the drawing, A indicates a detail of .a sound reproducing machineofthe disk type, having the usual turn table and tone arm or sound tube 3,which is swiveled vto turn in the usual manner as the sound boxwith itsneedle point or stylus follows 'the sound gro ve of the record on theturn table, either loward the center thereof or outwardy toward itsperiphery. The turn table '2 has the usual downwardly extendmg flange 4on its peri hery and arranged to engage the inner sin ace of this flangeis the bralre B, of trigger type, forming part of my invention. Thisbrake has its brake member 6 produced from a single piece of sheet metalor other suitable material havmg a tiltable brake shoe arm 7. pivoted bythe screw 8 on the plate 9,which is secured. to the top 10 of the soundreproducing maf'llll'lt) by screws 11 or other suitable means.

Extending from the tiltable member 7 is an operating lever 12 by whichthe brake shoe member 6 can be tilted onits pivot. The extremity of thebrake shoe arm 7 has a brake shoe or buffer element 13, which isarranged so that when the operatinglever 12 is forced inwardly below theturn table, retarding action is applied against the inner surface of theflange 4- by the bufler element 13, and when said lever 12 is shift, edoutwardly, the buffer element 13 is tilted out of contact with saidflange and into connection with a catch or trigger 14, said catchengaging the shoulder 15 on the brake element and serving to hold thebrake element out of braking position. A coil spring 16 attached to anarm 17 on'the brake element and to the catch 14 tends to releasably holdthe brake element and catch 14 engaged. The arm .12 is extensible bysections secured by screw 12' and slot 12'? connection for differentadjustments.

The catch 14 is pivoted by the screw 17 on the plate 9 and carries areleasing arm 18 by the depression of which inwardly be-. low the turntable, the hook 14 is disengaged from the shoulder 15 and the brakeelement released and set under the action of the spring 16. This brakeis arranged on the top of the sound reproducing machine in position, sothat when the brake element is set: the buffer will engage the innersurface of the flange of the turn table and stop the machine, and whensaid brake element is engaged by the catch 14, it is released and heldout of contact with said flange. A stop 18 is provided with a shoulder21 with the surface of which a stop (J carried by the tone arm isadapted to press and automatically release the catch ll and allow thebrake to engage and stop the turn table from revolving. The arm 12performs the function of a hand setting device for the brake and the arm18 the function of a release for setting said brake. The arm 18 is alsoextensible by sections secured by screw 18 and slot 18 connections foradjustment purposes. The stop is eurried by a split ring which isclamped rigidly around the vertical portion of the [one arm. so that itwill turn concentrically about the vertical axis of the tone arm as thelatter swings during the operation of, the machine when playing. Thissplit ring carries a downwardly and outwardly extending support 26, uponwhich a primary stoparm 27 is pivotally secured by the screw 28.Thisvprimary stop arm in turn carries a secondary stop arm 29. which ispivotally secured thereto by the screw 30. the pivot motion of both theprimary and secondary stop elements being horizontal. The secondary stoparm is arranged, so as to strike the shoulder 21 and cause the catch1-1- to release the brake element 6 at a pred'etermined instant as thetone 'arm moves horizontally when a record is being played. Beforeplaying therecord. the stop members are set in position on their pivots.so that the'stop member .29 will move into contact with the releasingmember 18 when the stylus or other sound reproducing point reaches theend of the sound groove of the record being played. This is accomplishedby first setting the reproducing point at the end of the sound grooveand then moving the stop arm 2%) un' til it presses against the shoulder21 when the brake element 6 is in set position, and then moving the tonearm into starting position and releasing the brake with the catch 14 inengagement with the shoulder 15. thus allowing the turn table to revolvefreely.

In the operation just described. there is a predetermined distance whichthe brake member 6 and arm 18 will travel from stopping position intococked position of said brake member. This lost motion unlesscompensated by the triprenders the setting of the brake into brakingposition at precisely a predetermined instant when the end of the soundgroove is reached by the reproducing pomt inaccurate and imperfect. Toover .come this imperfection and cause the brake to be set instantlywhen desired. I have pro-- vided the secondary stop member 29. whichplays freely on the pivot 30. it being guided in its movement by a pin31 passing freely through a slot 32. which isarranged concentric to thepivot 30. The force required I I15 to'move the catch 14 out ofengagement with pin 31. thus permitting the arm 27 the shoulder 15 bydepressing the releasing arm 18 is greater than the force required toswing the secondary stop member 29 upon its pivot Ill). but the frictionor binding tendency between the primary stop member 2? and the support:36 is arranged to be much greater than the force required to urge thereleasing member 18 into releasing position and cause the setting of thebrake. Arranged in the end of an extension 33 on the secondanvstopmember is an obstruction 34 in the form of an adjusting sore" the innerend of which is adapted to impinge or press against onc side of theprimary stop member. (see Fig. 2). so that when adjusting the primarystop member 2'? by swinging the end of the secondary trip mem her inposition aganst the shoulder :21 when the sound reproducing point ispositioned at the end of the sound groove in the record about to beplayed while the brake is in set position. the stop will subsequentlysci, the brake precisely at the desired predetermined instant when therecord is being played. 'hen the playing of the record is started. andthe brake moved into released position,

the lost motion of the releasing arm 19' caused by the movement of thebrake into released position. or in other words the lost motionoccurring between the reproducing point cf the machine and the means forstopping the record moving element. is compensated by the subsequentfree movement of the secondary stop member '29 when the latter comesinto contact with the end of the releasing member 13 until a side edgeof the primary member 27 comes into contact with the shoulder 21.whereupon the brake is set. The end of the slot 32 limits the backwardmovement of arm 29 and strikes the to be moved back by arm :25) whendesired. a result mv invention produces a stop for the brake. which willinstantly release the brake without any lostmotion when the soundrcproducing point reaches substantially the exact place on the record atwhich it is de sired that the machine shall cease playing. An opening15' through plate 9 is rovided to admit a file for accurately filing t1e shoulders on members 6 and 14.

My invention may be variously modified within the spirit thereof forinstance, the support 26 for the stop may be constructed as illustratedin Fig. 3 in which the arm 26. is attached by screws 26" to the tonearm. The compensating stop may as illustrated in Fig. 4 be in the formof a disk 40 rotatably mounted upon the rigid support l1. which isadapted to be carried by the tone arm in place of the primary andsecondarv stop members illustrated in Pig. 1. This disk has a segmentthereof cut away. the depth of l&

setting member 18 to be moved when releasing the brake into brakingposition. The

ulisk in setting the device for operation is first turned, so that theouter peripheral surface 43 will press a ainst the shoulder 21 record isstarted, the disk is turned so that the outer peripheral surface 42 willcontact with the shoulder 21 and cause the setting of the brakeinstantly when the sound. reproducing point reaches the desired point inthe sound groove of the record.

In the construction illustrated in Figs, 5 and 6, the holder for thetrip instead of being a split ring as illustrated in Fig. 5 isconstructed with a pair oi spring arms 50 and 51, which removably clasp,the grooved ring 52 secured on the vertical portion ofthe tone arm.These arms 50 and 51 carry the depending outstanding support 53 uponwhich the single sto arm 54 is pivoted, by the screw 55. The arm 54 isfreely pivoted, that is the force required to move the releasing ortrigger arm 18 is greater than the force required to swing the arm 54 onits pivot. The body of the arm 54 about the pivot 55 has a concentricrecess 56 at the opposite ends ,of which are the shoulders 57 and 58.Carried by the support 53 are two stops, the one 59 being rigid andagainst which the shoulder 58 presses when the arm 54 is turnedbackwardly, and the other being adjustable and serving to limit themovement of the arm 54 in the opposite direction. The, limited freemovement thus allowed the arm 54 corresponds with the lost motion of thebrake release, above referred to. When setting the device to stopplaying at a predetermined instant the clasp formed by arms and 51 y isturned into adjusted position by moving arms 54 toward and into contactwith the shoulder 21, when the brake is set. When the reproducingpointapproaches stopping position the arm 54 moves backwardly until shoulder58 presses against pin 59, and the force required being greater to'movesaid clasp than to release catch 14. the arm 18 is depressed intoreleasing position and the brake is set. a

In Fig. 7 the primary arm 27 is shown constructed with a dependingshoulder 60 and the secondary arm 29 formed with two flanges 61 and 62,the flange 61 serving. to limit the swinging movement of the second aryarm in one direction and the flange 62 carrying an adjustable screw 63.the inner end of which serves to press against the flange GQHtQ definethe free movement afforded the secondary arms instead of the freemovement limiting means set forth in Fig. 13. pin 31-are not used.

In this construction the slot 32 and;

It is obvious that by turning the devices over, so that the uppersurfaces assume lowermost position and so that their parts move in anopposite direction, the invention will Serve to automatically stop :themachine when the reproducing oint travels out wardly instead of inwa-rly upon the record and reaches the outer end of the sound 1'8:

claim as new and desire to protect by Lettors Patent is '1. Brakemechanism in which a brake member occupies two positions, one where thebrake is set and the other where the brake is released, a tone arm,having a sup port, an actuating member on the supportadjustable to causethe setting of the brake, and means carried by the actuating memberadapted to compensate for a modetermi-ned amount of lost motion 0 saidparts.

Brake mechanism in which a brake member occupies two positions, onewhere the brake is set and the other where the brake is released, ,atone arm having a sup port adjustably secured thereto, an actuatmgmember adjustable in said support adapted to cause the setting of thebrake; and means carried respectively by each of said brake andactuating members adapted to be selectively positioned to compensate'for a predetermined amount of lost motion brake and actuating-membersadapted to be adjusted to compensate for a pretetermiued amount of lostmotion of said parts. 0

4. Brake mechanism in which a brake member occupies two positions onewhere the brake is set and the other where the brake is released, a tonearm having a support mounted thereon, an actuating member mounted onsaid support and adjustable about the tone arm adapted to cause the setting of the brake,andmeans carried by the actuating member adapted to beselectively positioned to compensate for a predetermined amount of lostmotion of said parts.

5. Brake mechanism in which a brake member occupies two positions, onewhere the brake is set and the other where the brake is released, a tonearm having a support mounted thereon, an actuating member mounted onsaid support and adjustable about the tone arm adapted to cause the set-10 ting of the brake, and means cooperating with said parts adapted tobe selectively positioned to compensate for u predetermined amount oflost motion of said parts.

In testimon whereof I have. si lied mv l5 name to this specification.

FRANCIS A. NOLAN.

